// Initialization


// class camera extends THREE.PerspectiveCamera
var PointerCamera = function() {
    THREE.PerspectiveCamera.apply(this, arguments);

    // Set Position
    this.theta = Math.PI;
    this.phi = Math.PI;

    this.keyboard = 'undefined';


    // Stuff for rendering
    this.position = new THREE.Vector3();
    this.forward = new THREE.Vector3();
    this.left = new THREE.Vector3();
    this.up = new THREE.Vector3(0,0,1);
    this.target = new THREE.Vector3(0,1,0);

    // Stuff for events
    this.moveForward = false;
    this.moveBackward = false;
    this.moveRight = false;
    this.moveLeft = false;

    this.sensitivity = 0.05;
    this.speed = 1;

    // Set events from the document
    var self = this;
    var onKeyDown = function(event) {self.onKeyDown(event);};
    var onKeyUp = function(event) {self.onKeyUp(event);};

    document.addEventListener('keydown', onKeyDown, false);
    document.addEventListener('keyup', onKeyUp, false);
}
PointerCamera.prototype = Object.create(THREE.PerspectiveCamera.prototype);
PointerCamera.prototype.constructor = PointerCamera;

// Update function
PointerCamera.prototype.update = function() {
    // Update angles
    if (this.increasePhi)   this.phi   += this.sensitivity;
    if (this.decreasePhi)   this.phi   -= this.sensitivity;
    if (this.increaseTheta) this.theta += this.sensitivity;
    if (this.decreaseTheta) this.theta -= this.sensitivity;

    // Clamp phi
    this.phi = Math.min(Math.max(-(Math.PI/2-0.1),this.phi), Math.PI/2-0.1);

    var delta = 0.1;

    // Update direction
    this.forward.z = Math.sin(this.phi);

    var cos = Math.cos(this.phi);
    this.forward.x = cos * Math.cos(this.theta);
    this.forward.y = cos * Math.sin(this.theta);
    this.forward.normalize();

    // Update
    var forward = this.forward.clone();
    forward.multiplyScalar(400.0 * delta);
    var left = this.up.clone();
    left.cross(forward);
    left.normalize();
    left.multiplyScalar(400.0 * delta);

    if (this.moveForward)  this.position.add(Tools.mul(forward, this.speed));
    if (this.moveBackward) this.position.sub(Tools.mul(forward, this.speed));
    if (this.moveLeft)     this.position.add(Tools.mul(left, this.speed));
    if (this.moveRight)    this.position.sub(Tools.mul(left, this.speed));

    this.target = this.position.clone();
    this.target.add(forward);
}

// Look function
PointerCamera.prototype.look = function() {
    this.lookAt(this.target);
}

PointerCamera.prototype.addToScene = function(scene) {
    scene.add(this);
}

PointerCamera.prototype.onKeyEvent = function(event, toSet) {
    switch ( event.keyCode ) {
        // Azerty keyboards
        case 38: case 90: this.moveForward  = toSet; break; // up / z
        case 37: case 81: this.moveLeft     = toSet; break; // left / q
        case 40: case 83: this.moveBackward = toSet; break; // down / s
        case 39: case 68: this.moveRight    = toSet; break; // right / d

        // Qwerty keyboards
        // case 38: case 87: this.moveForward  = toSet; break; // up / w
        // case 37: case 65: this.moveLeft     = toSet; break; // left / a
        // case 40: case 83: this.moveBackward = toSet; break; // down / s
        // case 39: case 68: this.moveRight    = toSet; break; // right / d

        case 104: this.increasePhi   = toSet; break; // 8 Up for angle
        case 98:  this.decreasePhi   = toSet; break; // 2 Down for angle
        case 100: this.increaseTheta = toSet; break; // 4 Left for angle
        case 102: this.decreaseTheta = toSet; break; // 6 Right for angle
    }
}

PointerCamera.prototype.onKeyDown = function(event) {
    this.onKeyEvent(event, true);
}

PointerCamera.prototype.onKeyUp = function(event) {
    this.onKeyEvent(event, false);
}

// Static members
PointerCamera.DISTANCE_X = 1000;
PointerCamera.DISTANCE_Z = 300;